Detailed Land Cover Mapping from Multitemporal Landsat-8 Data of Different Cloud Cover

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Detailed Land Cover Mapping from Multitemporal Landsat-8 Data of Different Cloud Cover remote sensing Article Detailed Land Cover Mapping from Multitemporal Landsat-8 Data of Different Cloud Cover Christina Karakizi 1,*, Konstantinos Karantzalos 1, Maria Vakalopoulou 2 and Georgia Antoniou 1 1 Remote Sensing Laboratory, National Technical University of Athens, 157 80 Zografou, Greece; [email protected] (K.K.); [email protected] (G.A.) 2 Centre de Vision Numérique, CentraleSupélec, INRIA, Université Paris-Saclay, 91190 Gif sur Yvette, France; [email protected] * Correspondence: [email protected]; Tel.: +30-210-7721673 Received: 22 June 2018; Accepted: 26 July 2018; Published: 2 August 2018 Abstract: Detailed, accurate and frequent land cover mapping is a prerequisite for several important geospatial applications and the fulfilment of current sustainable development goals. This paper introduces a methodology for the classification of annual high-resolution satellite data into several detailed land cover classes. In particular, a nomenclature with 27 different classes was introduced based on CORINE Land Cover (CLC) Level-3 categories and further analysing various crop types. Without employing cloud masks and/or interpolation procedures, we formed experimental datasets of Landsat-8 (L8) images with gradually increased cloud cover in order to assess the influence of cloud presence on the reference data and the resulting classification accuracy. The performance of shallow kernel-based and deep patch-based machine learning classification frameworks was evaluated. Quantitatively, the resulting overall accuracy rates differed within a range of less than 3%; however, maps produced based on Support Vector Machines (SVM) were more accurate across class boundaries and the respective framework was less computationally expensive compared to the applied patch-based deep Convolutional Neural Network (CNN). Further experimental results and analysis indicated that employing all multitemporal images with up to 30% cloud cover delivered relatively higher overall accuracy rates as well as the highest per-class accuracy rates. Moreover, by selecting 70% of the top-ranked features after applying a feature selection strategy, slightly higher accuracy rates were achieved. A detailed discussion of the quantitative and qualitative evaluation outcomes further elaborates on the performance of all considered classes and highlights different aspects of their spectral behaviour and separability. Keywords: classification; crop-type mapping; support vector machines; deep learning; machine learning; CORINE 1. Introduction Land cover is one of the essential terrestrial climate variables [1] and therefore land cover information in terms of regularly updated, detailed and accurate land cover maps arises as a significant input for several scientific communities working on climate change studies, geomorphology, sustainable development and social sciences, natural resources management and agricultural monitoring. At the same time, open data policies in both the USA and EU are delivering an unprecedented volume of satellite imagery data with an increasing level of spatial, spectral and temporal resolution. Currently, the availability of Landsat-8 (L8) and Sentinel-2 data significantly increases the capacity for high-resolution land cover mapping using dense time series while demanding efficient and cost-effective classification methods. Recent research efforts have focused on the use of finer resolution satellite imagery for land cover map production, offering products at a global scale Remote Sens. 2018, 10, 1214; doi:10.3390/rs10081214 www.mdpi.com/journal/remotesensing Remote Sens. 2018, 10, 1214 2 of 27 such as the updated version of FROM-GLC [2], the FROM-GLC-agg [3] product with nine general land cover classes at 30 m and an estimated accuracy of 65.51%, and the recent GlobeLand 30 product [4], providing land cover information at 30 m with 10 land cover classes. Landsat archive data were also employed for national-level product approaches such as the 30 m map of 16 classes from the USA National Land Cover Database [5] as well as the recent land cover map of France with 17 classes and an achieved accuracy of over 80% [6]. Additionally, focusing on agricultural landscapes, Xiong et al. [7] produced a nominal 30-m cropland extent product of the entire African continent using Sentinel-2 and L8 time series for the year 2015, resulting in a weighted overall accuracy of 94.5% for binary classification of cropland versus non-cropland areas. Beyond the achieved and reported overall accuracy rates, a key aspect of the produced map, in terms of usability and applicability, is the number of land cover classes considered. Most of the aforementioned products do not incorporate a highly analytic classification system and nomenclature in order to deliver detailed information regarding several different land cover classes. On the other hand, mapping products that deliver a rich class nomenclature, like the CORINE Land Cover (CLC), are not regularly updated since they are based mainly on laborious image interpretation and manual digitization procedures. Furthermore, regarding the challenging case of agriculture, even in the detailed CLC product, crop areas like arable land are mapped depicting the implied agricultural practice and not the specific crop cultivated. Recent studies [8–11] have indicated that crop mapping is quite a challenging problem requiring high spatial and temporal resolution data but also a significant amount of crop-type reference data. Regarding the production of annual land cover maps based on multitemporal datasets, a number of approaches have employed data from two different seasons [12,13], while the general trend is to employ frameworks that can exploit all the available annual data (below a given cloud presence threshold). However, how and to what extent the presence of clouds affects the accuracy and effectiveness of mapping and monitoring applications has not been studied adequately, and further insights are required [14]. In particular, for discriminating between different crop types, more multitemporal observations are required in order to note key periodic events in the life cycle of different species (phenology), sufficiently capturing spatial, spectral and temporal features [9,10,15]. However, in most geographical regions and climate zones it is rare to find several absolutely clean, cloud-free images [14,16]. The norm is that even the clearest images of a Landsat path/row or Sentinel tile will contain a number of pixels that are affected by different type of clouds. Although, recent efforts are employing cloud masks and interpolation procedures to tackle invalid values and produce synthesized data [6,8,9], cloud detection approaches (e.g., f-mask) fail to detect all clouds/cloud types in a scene (especially cirrus, warm or thin clouds) and therefore even with cloud masks multitemporal datasets include noisy pixels (e.g., clouds, shadows). Moreover, all additional processes (e.g., interpolation) require/cost a significant amount of CPU and/or GPU hours. Another critical issue concerning land cover map production is the selection of the classification method and algorithm. Supervised classification methods are considered superior to unsupervised for this type of study [6,17,18], but they require the use of accurate and sufficient training data. Additionally, the use of machine learning techniques like Support Vector Machines—SVM [19,20], Random Forests—RF [21] and artificial Neural Networks—NN have gained rapid recognition for classification studies. SVM have been widely used in recent land cover and crop type classification literature [22–26], while in many cases they have been reported to outperform algorithms like RF and NN [18,27,28]. SVM offers the ability to attain high classification accuracies even if using small training sets [27,29,30], and has also proven robust for low noise levels in the presence of mislabelled training data [22]. An important advantage of the SVM classifier is its ability to manage well a large feature space, which is the case when classifying multi-temporal multispectral imagery [31]. RF classifiers have been also reported to achieve high accuracy metrics in similar classification tasks [9,22,32], while studies have indicated that RF may present lower sensitivity to mislabelled training data than SVM [22]. On the other hand, deep learning is currently one of the fastest-growing trends in remote sensing data analysis, Remote Sens. 2018, 10, 1214 3 of 27 successfully tackling a variety of challenging problems and benchmark datasets in object recognition, semantic segmentation and image classification [33–36]. In particular, Convolutional Neural Networks (CNNs) are currently heavily used for classification and semantic segmentation tasks in a variety of remote sensing datasets [28,37–39]. However, compared to more shallow architectures (e.g., SVM), the operational and complexity aspects of CNN-based techniques are directly associated with the considered data dimensionality, which is a key limitation when employing several spectral bands and/or multitemporal datasets [25,40]. Towards addressing the aforementioned challenges, in this paper we introduce a framework for systematic, detailed land cover mapping from annual L8 satellite data. In particular, we consider 27 classes based on CLC Level-3 nomenclature, focusing on the cover type and not the use type classes, while analysing further the crop type classes. Without employing cloud masks or interpolation procedures to recover
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